The Beechcrafts were used by Canada, China, United Kingdom, and United States.
The United States Navy used the JRBs as transports for personnel. The United States Army used the C-45s and F-2s as transports and photographic aircraft.
United States Army Air Force First Use
In 1940 the Beechcraft Model 18 was first used by the United States Army Air Force. Eleven Model 18s (designated the C-45) were ordered for staff tranports.
Royal Air Force (RAF) and Royal Navy
430 C-45s were delivered to the Royal Air Force and Royal Navy.